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Science true or false

Matter in Our Surroundings · Bihar Board (BSEB) STD 9 (BSEB - English Medium). 4 questions.

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4 questions · timed · auto-graded

Question 11 Mark
In pressure cooker water boils above $100^\circ C$. [True/ False]
Answer
Food is cooked more quickly in a pressure cooker because at the higher pressure $(1\ bar/ 15\ psi)$, the boiling point of water rises from $100^\circ C (212^\circ\ F)$ to $121^\circ\ C (250^\circ\ F)$.
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Question 21 Mark
Sea water boils below $100^\circ\ C$. [True/ False]
Answer
False.
Pure water boils at $100$ degrees Celsius under normal atmospheric pressure, but the Dead Sea surface is so low (more than $400$ meters below "sea level") that water boils at about $101$ degrees there. It does boil at a higher temperature because of the high amounts of non-volatile solids.
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Question 31 Mark
State whether the following statement is true or false: Red brown bromine vapour diffuse into air in a gas jar but the colourless air molecules do not diffuse into bromine vapour.
Answer
False.
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Question 41 Mark
State whether the following statement is true or false: Solid carbon dioxide is stored under low pressure.
Answer
False.
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true or false - Science STD 9 Questions - Vidyadip